This article presents results of electromagnetic (EM) simulation and experimental research of an original tapered slot antenna with modified topology and double-sided metallization. A comparison of ...this antenna with classical and antipodal topology is performed. Advantages and disadvantages of each of them are described. It is shown that due to the mirror symmetry planes in E- and H-planes, the proposed antenna has the highest crosspolar isolation and demonstrates electrodynamic characteristics acceptable for practice in the frequency range 0.5–6.6 GHz. Transition from an asymmetric 50-Ω coaxial line to a symmetric 100-Ω slotted line is made with the help of a balun placed in the same plane as the antenna. The latter simplifies the manufacturing process and radically reduces the longitudinal dimensions of the antenna. The research results indicate on potential application possibilities of the developed tapered slot antenna in various areas of wireless technologies.
The analysis results of a dual-mode loop resonator with a stub tunable by two variable capacitors are presented. It was established for the first time that, contrary to the existing idea, such ...resonators have not only dual-mode oscillations, but also single-mode oscillations, and these oscillations alternate with each other. The resonant frequencies of these resonators are described not by two but by three resonance equations: one equation for single-mode oscillations and two equations for even and odd modes of dual-mode oscillations. The single-mode oscillations are fixed and do not depend on variable capacitances. The range of even and odd modes of dual-mode oscillations is different. The even mode has a wider resonant region and is characterized by a higher range. It is proved that an increase in the characteristic impedance of the stub leads to an expansion of the range of the odd mode, and, consequently, of the dual-mode oscillation. The results of experimental measurements and simulation are presented.
The stages of refinement of the Vivaldi antenna, which has both coplanar and antipodal radiators, is given, which gives it an advantage over the known Vivaldi antennas. The electromagnetic simulation ...results obtained with the CST studio suite software were compared with the experimental results of the printed coplanar-antipodal antenna measurements with the Anritsu MS46122A vector analyzer, resulting in a good correlation of results. The ultra-wideband radar antenna has minimal cross polarization and will later be used to emit and receive picoseconds pulses. The design is based on slotted lines or a modified Vivaldi antenna. The maximum achievable gain is 10 dBi in the 6-8 GHz frequency range. The coplanar-antipodal antenna is powered by a matching balloon to which a 50-ohm coaxial line is connected at one end and a 100-ohm antenna at the other. Simple configuration and wide bandwidth make the proposed coplanar-antipodal antenna a good option for versatile communication tasks.Antenna requirements: low cross polarization matching; work in UWB, frequency range 0.5-8 GHz; VSWR≤2.0; flat shape with compact dimensions; low losses; maximum focus, minimum level of side lobes.
The report presents a solution to a complex problem for microstrip second-order bandpass filters (BPFs) with a narrow passband, which consists in increasing the selectivity, decreasing the insertion ...loss, and decreasing the size. For this, stepped-impedance resonators (SIRs) and relatively thick dielectric substrates with a high dielectric constant \varepsilon_{\mathrm{r}}=100 are used. Mixed electromagnetic couplings operate between closely spaced SIRs, which allows the formation of attenuation poles without the use of cross-couplings, and increases selectivity. The use of thick substrates leads to an increase in the unloaded Q-factor of the resonators Q_{u} and a corresponding decrease in the BPF insertion loss. Small dimensions are provided by using substrates with \varepsilon_{r}=100 and closely spaced SIRs. The results of computer EM simulation of frequency responses of two narrowband microstrip BPFs for GPS (Global Position System) are presented. It was found that in terms of the totality of indicators, these filters are competitive in comparison with monoblock ceramic filters and filters based on coaxial dielectric resonators.
Two Types of Stepped-Impedance Resonators in Stripline Bandpass Filters Litvintsev, Sergii; Rozenko, Sergii; Kozachuk, Maxim
2022 IEEE 16th International Conference on Advanced Trends in Radioelectronics, Telecommunications and Computer Engineering (TCSET),
2022-Feb.-22
Conference Proceeding
The results of a study of two types of stripline bandpass filters (BPFs) with stepped-impedance resonators (SIRs), which are made on Al 2 O 3 (Alumina) substrates, are presented. Both SIRs have one ...short-circuited end and the other end is open-circuited. The segment adjacent to the short-circuited end has a higher characteristic impedance for the SIR of the first type, and a lower characteristic impedance for the SIR of the second type. The use of both types of SIRs in BPFs allows suppression of multiple harmonics (2 f 0 , 3 f 0 , 4 f 0 ,...) of the fundamental signal with frequency f 0 . It has been experimentally established that the SIR of the second type has a higher unloaded Q-factor, which provides BPFs with lower insertion loss and higher handling power.
